Papers - KATAYAMA Ikufumi
about 124-
Katayama, I; Uchida, K; Takashina, K; Kishioka, A; Kaiho, M; Kusaba, S; Tamaki, R; Shudo, K; Kitaji … Show more authors
Katayama, I; Uchida, K; Takashina, K; Kishioka, A; Kaiho, M; Kusaba, S; Tamaki, R; Shudo, K; Kitajima, M; Ngo, TD; Nagao, T; Takeda, J; Tanaka, K; Matsunaga, T Hide authors
COMMUNICATIONS PHYSICS 7 ( 1 ) 2024.12
Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Joint Work
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Satoshi Kusaba ORCID logo ; Haw-Wei Lin ORCID logo ; Ryo Tamaki; Ikufumi Katayama ORCID logo … Show more authors
Satoshi Kusaba ORCID logo ; Haw-Wei Lin ORCID logo ; Ryo Tamaki; Ikufumi Katayama ORCID logo ; Jun Takeda ORCID logo ; Geoffrey A. Blake Hide authors
APPLIED PHYSICS LETTERS 124 ( 12 ) 2024.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Kim D.-I., Kawaji Mizuki, Sato Hiroki, Kawamura Ryota, Tamaki Ryo, Kusaba Satoshi, Wang Yinli, Shua … Show more authors
Kim D.-I., Kawaji Mizuki, Sato Hiroki, Kawamura Ryota, Tamaki Ryo, Kusaba Satoshi, Wang Yinli, Shuang Yi, Sutou Yuji, Katayama Ikufumi, Takeda Jun Hide authors
Japanese Journal of Applied Physics 63 ( 1 ) 2024.1
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing Joint Work
Cr2Ge2Te6 (CrGT) is viewed as an important phase change material (PCM) for next-generation nonvolatile memory devices because of its superior properties, e.g., high thermal stability and low operation energy, compared to conventional PCMs. However, the phase change mechanism of CrGT remains unsolved, especially at the nanoscale. Here, we investigated thermally induced nanoscale phase changes of CrGT thin films using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). By performing statistical analysis of the measured STM topographic and STS data, we evaluated the inhomogeneity and distribution of the phase change characteristics of CrGT thin films. We also related the nanoscale phase change properties of CrGT to macroscopic phase changes by comparing the STM and STS results with experimental data from Raman spectroscopy.
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Kim, DI; Kawaji, M; Sato, H; Kawamura, R; Tamaki, R; Kusaba, S; Wang, YL; Shuang, Y; Sutou, Y; Kata … Show more authors
Kim, DI; Kawaji, M; Sato, H; Kawamura, R; Tamaki, R; Kusaba, S; Wang, YL; Shuang, Y; Sutou, Y; Katayama, I; Takeda, J Hide authors
JAPANESE JOURNAL OF APPLIED PHYSICS 63 ( 1 ) 2024.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Single-shot terahertz waveform detection of resonant tunneling diode in time-domain
Tamaki, R; Takahashi, K; Arikawa, T; Katayama, I
2024 49TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ 2024 2024
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Single-molecule electroluminescence induced by THz-field-driven electron tunneling
Kimura, K; Tamaki, R; Imada, H; Katayama, I; Takeda, J; Kim, Y
2024 49TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ 2024 2024
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Observation of interplay between phonon chirality and electronic band topology
Hernandez, FGG; Baydin, A; Chaudhary, S; Tay, F; Katayama, I; Takeda, J; Nojiri, H; Okazaki, AK; Ra … Show more authors
Hernandez, FGG; Baydin, A; Chaudhary, S; Tay, F; Katayama, I; Takeda, J; Nojiri, H; Okazaki, AK; Rappl, PHO; Abramof, E; Rodriguez-Vega, M; Fiete, GA; Kono, J Hide authors
SCIENCE ADVANCES 9 ( 50 ) 2023.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast pump-probe spectroscopy via chirped-pulse up-conversion with dispersion compensation
Tamaki, R; Suzuki, M; Kusaba, S; Takeda, J; Katayama, I
OPTICS EXPRESS 31 ( 24 ) 40142 - 40150 2023.11 [Reviewed]
DOI Web of Science PubMed CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：Optica Joint Work
In this study, ultrafast transient signals were detected on a single-shot basis using chirped-pulse up-conversion spectroscopy with dispersion compensation. Unlike in the conventional time-encoding technique using chirped pulses, distortion of the ultrafast waveform was reduced by applying dispersion compensation to the chirped probe pulses and using sum-frequency generation with the chirped readout pulses. The method was applied to terahertz time-domain spectroscopy and near-infrared pump–probe spectroscopy, providing ultrafast observations with an improved temporal resolution comparable to the transform-limited pulse durations. Terahertz waveforms, Kerr rotation signals, and phonon-polariton oscillations were measured accurately with no significant waveform distortion, thereby showing the proposed scheme to be promising for single-shot pump–probe spectroscopy in a wide range of spectroscopic applications.
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Magnetically tuned continuous transition from weak to strong coupling in terahertz magnon polaritons
Andrey Baydin, Kenji Hayashida, Takuma Makihara, Fuyang Tay, Xiaoxuan Ma, Wei Ren, Guohong Ma, G. T … Show more authors
Andrey Baydin, Kenji Hayashida, Takuma Makihara, Fuyang Tay, Xiaoxuan Ma, Wei Ren, Guohong Ma, G. Timothy Noe, II, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Shixun Cao, Motoaki Bamba, and Junichiro Kono Hide authors
Physical Review Research 5 ( 1 ) L012039 2023.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.L012039
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Ikufumi Katayama, Kensuke Kimura, Hiroshi Imada, Yousoo Kim, and Jun Takeda
Journal of Applied Physics 133 ( 11 ) 10903 2023.3 [Reviewed] [Invited]
DOI Web of Science CiNii Research
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Single Work
The combination of terahertz (THz) pulses with scanning tunneling microscopy (STM) enables us to investigate ultrafast dynamics at material surfaces with high spatial (nanoscale) and temporal (femtosecond) resolution. In this Perspective, we review the basic principles of THz-STM, outline the related literature, and discuss its future outlook capable of advancing nanoscience, especially by introducing further combination of THz-STM with scanning tunneling luminescence spectroscopy, which can extract more fruitful information about nanoscale materials via obtaining luminescence spectra compared to just observing the net tunneling current induced by THz pulses in THz-STM. By shining THz pulses onto an STM tip, we can observe plasmon luminescence locally confined between the tip and the surface, whose spectrum changes with tip conditions. The combined approach is a stepping stone toward investigating the ultrafast excited-state dynamics of nanoscale materials with high spatiotemporal resolution.
Other Link： https://aip.scitation.org/doi/10.1063/5.0144218
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Pulse-to-pulse Ultrafast Dynamics of Highly Photoexcited Ge2Sb2Te5 Thin Films
62 ( 2 ) 022001 2023.2 [Reviewed]
DOI Web of Science CiNii Research
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
Other Link： https://iopscience.iop.org/article/10.35848/1347-4065/acb476
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Tamaki, R; Takeda, J; Katayama, I
2023 48TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ 2023
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Exciton formation in a single molecule triggered by field-driven ultrafast electron tunneling
Kimura Kensuke, Imada Hiroshi, Katayama Ikufumi, Takeda Jun, Kim Yousoo
日本表面真空学会学術講演会要旨集 2023 ( 0 ) 2Bp02 2023
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本表面真空学会 Joint Work
<p>The combination of a single-cycle THz pulse and a scanning tunneling microscope (STM) enables to investigate ultrafast dynamics with the nanometer and picosecond resolutions [1-5]. In THz-STM, the tunnel barrier of STM junction is modulated by the oscillation of electric field of THz pulse. Due to the bandwidth of electrical circuit, conventional THz-STM only measures “time-averaged” or “net” field-driven tunneling current, thus it is difficult to determine how electrons are manipulated by positive and negative components within a single-cycle electric field oscillation. By combining a photon detection system with a THz-STM, it enables to investigate excitation and energy dissipation processes triggered by THz-field-driven tunneling [5]. In this work, we revealed field-driven ultrafast charge transfer between the STM tip and a molecule by measuring luminescence signal from the molecule (Fig. 1a).</p><p></p><p>Single-cycle THz pulses were generated by using optical rectification of laser pulses from a Yb fiber laser (1035 nm, 50 MHz, 40 W) in a LiNbO<sub>3</sub> prism. The carrier envelope phase (CEP) of THz pulse can be tuned by using a CEP shifter [4]. The CEP-controlled THz pulses were guided to an STM (5 K, 1 × 10<sup>-11</sup> Torr) and focused to the junction. The CEP of near field THz electric field was evaluated by measuring the tunneling current on a clean Ag(111) surface (Fig. 1a) [4]. The photons generated at the STM tip is collected using a lens inside the STM and directed out of the ultrahigh vacuum chamber, where it was refocused onto a grating spectrometer with a charge coupled device (CCD) photon detector.</p><p></p><p>Figure 1b shows THz-STM luminescence (THz-STL) spectra of a Pd-phthalocyanine (PdPc) on NaCl ultrathin film grown on Ag(111). The luminescence peak originated from the fluorescence of a PdPc is observed at 1.84 eV only when THz pulses were irradiated (red spectra in Fig. 1b). Figure 1c shows CEP dependence of molecular luminescence intensity, where CEP = π is defined as ΔCEP = 0. In the CEP dependence, the luminescence intensity is maximum at around ΔCEP = π/6 and zero at around ΔCEP = ± π. This result indicates that the THz waveform is responsible for the exciton formation. In this presentation, we would like to discuss the mechanism of exciton formation in a molecule by THz-field-driven ultrafast charge transfer between the STM tip and the molecule.</p><p></p><p>[1] T. L. Cocker et al., Nature <b>539</b>, 263 (2016).</p><p>[2] K. Yoshioka et al., Nat. Photon. <b>10</b>, 762 (2016).</p><p>[3] S. Yoshida et al., ACS photon. <b>8</b> 315 (2021).</p><p>[4] K. Yoshioka et al., Nano Lett. <b>18</b>, 5198 (2019)</p><p>[5] K. Kimura et al., ACS photon. <b>8</b>, 982 (2021).</p>
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Soungmin Bae, Kana Matsumoto, Hannes Raebiger, Ken-ichi Shudo, Yong-Hoon Kim, Ørjan Sele Handegård, … Show more authors
Soungmin Bae, Kana Matsumoto, Hannes Raebiger, Ken-ichi Shudo, Yong-Hoon Kim, Ørjan Sele Handegård, Tadaaki Nagao, Masahiro Kitajima, Yuji Sakai, Xiang Zhang, Robert Vajtai, Pulickel Ajayan, Junichiro Kono, Jun Takeda & Ikufumi Katayama Hide authors
Nature Communications 13 4279 2022.7 [Reviewed]
Authorship：Last author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://www.nature.com/articles/s41467-022-32008-6
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Bae, S; Matsumoto, K; Raebiger, H; Shudo, K; Kim, YH; Handegård, OS; Nagao, T; Kitajima, M; Sakai, … Show more authors
Bae, S; Matsumoto, K; Raebiger, H; Shudo, K; Kim, YH; Handegård, OS; Nagao, T; Kitajima, M; Sakai, Y; Zhang, X; Vajtai, R; Ajayan, P; Kono, J; Takeda, J; Katayama, I Hide authors
NATURE COMMUNICATIONS 13 ( 1 ) 4279 2022.7
DOI Web of Science PubMed CiNii Research
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：nature Joint Work
In transition metal dichalcogenides, valley depolarization through intervalley carrier scattering by zone-edge phonons is often unavoidable. Although valley depolarization processes related to various acoustic phonons have been suggested, their optical verification is still vague due to nearly degenerate phonon frequencies on acoustic phonon branches at zone-edge momentums. Here we report an unambiguous phonon momentum determination of the longitudinal acoustic (LA) phonons at the K point, which are responsible for the ultrafast valley depolarization in monolayer MoSe2. Using sub-10-fs-resolution pump-probe spectroscopy, we observed coherent phonons signals at both even and odd-orders of zone-edge LA mode involved in intervalley carrier scattering process. Our phonon-symmetry analysis and first-principles calculations reveal that only the LA phonon at the K point, as opposed to the M point, can produce experimental odd-order LA phonon signals from its nonlinear optical modulation. This work will provide momentum-resolved descriptions of phonon-carrier intervalley scattering processes in valleytronic materials.
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Pulse-to-pulse detection of terahertz radiation emitted from the femtosecond laser ablation process
Tamaki Ryo, Kasai Tatsuki, Asai Gaku, Hata Daiki, Kubo Hajime, Takigawa Yuichi, Takeda Jun, Katayam … Show more authors
Tamaki Ryo, Kasai Tatsuki, Asai Gaku, Hata Daiki, Kubo Hajime, Takigawa Yuichi, Takeda Jun, Katayama Ikufumi Hide authors
OPTICS EXPRESS 30 ( 13 ) 23622 - 23630 2022.6 [Reviewed]
DOI Web of Science PubMed CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：Optica Joint Work
Determining the dynamics of electrons and ions emitted from a target material during laser ablation is crucial for desirable control of laser processing. However, these dynamics are still challenging to understand because of a lack of ubiquitous spectroscopic tools to observe tangled-up dynamics appearing at ultrafast timescales. Here by harnessing highly sensitive single-shot terahertz time-domain spectroscopy using an echelon mirror, we investigate pulse-to-pulse temporal profile of terahertz radiation generated from the material surface. We clearly found that the carrier–envelope phase and the electric field amplitude of the terahertz waveform systematically vary between the pre- and post-ablation depending on the laser fluence and irradiated pulse numbers. Our results provide a stepping-stone towards perception of Coulomb explosion occurring throughout the laser ablation process, which is indispensable for future laser processing applications.
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Magnetic Control of Soft Chiral Phonons in PbTe
Andrey Baydin, Felix G. G. Hernandez, Martin Rodriguez-Vega, Anderson K. Okazaki, Fuyang Tay, G. Ti … Show more authors
Andrey Baydin, Felix G. G. Hernandez, Martin Rodriguez-Vega, Anderson K. Okazaki, Fuyang Tay, G. Timothy Noe, II, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Paulo H. O. Rappl, Eduardo Abramof, Gregory A. Fiete, Junichiro Kono Hide authors
Physical Review Letters 128 ( 7 ) 075901 2022.2 [Reviewed]
DOI Web of Science PubMed CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society Joint Work
PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our Letter reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field.
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Femtosecond Ablation Dynamics Observed with Terahertz Radiation
Tamaki Ryo, Kasai Tatsuki, Asai Gaku, Hata Daiki, Kubo Hajime, Takigawa Yuichi, Takeda Jun, Katayam … Show more authors
Tamaki Ryo, Kasai Tatsuki, Asai Gaku, Hata Daiki, Kubo Hajime, Takigawa Yuichi, Takeda Jun, Katayama Ikufumi Hide authors
2022 47TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ 2022) 2022
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Fano resonance of optical phonons in a multilayer graphene stack
Kitajima Masahiro, Katayama Ikufumi, Handegard Orjan Sele, Nagao Tadaaki, Chiashi Shohei, Maruyama … Show more authors
Kitajima Masahiro, Katayama Ikufumi, Handegard Orjan Sele, Nagao Tadaaki, Chiashi Shohei, Maruyama Shigeo, Takeda Jun Hide authors
JAPANESE JOURNAL OF APPLIED PHYSICS 60 ( 12 ) 122006 2021.12 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：{IOP} Publishing Joint Work
We studied Fano interference between the Raman spectrum of G-band phonons and electron continuum in a multilayer graphene stack. The thickness and power dependencies of the Fano interference coefficient ∣1/q∣ in the G-mode, where q is the Fano asymmetry parameter, were spatially visualized and analyzed using the Gaussian-convoluted Breit–Wigner–Fano function. The estimated ∣1/q∣ decreases with an increase in the layer number and laser power in the low-power region at least for monolayer, bilayer, and trilayer graphene. In the higher-power region, ∣1/q∣ increases with power only for monolayer graphene. The observed behaviors of ∣1/q∣ reflect the phase difference of Raman signals from the electron continuum and G-band and possibly originate from changes in the electronic relaxation time and the Fermi level of graphene owing to the laser heating of the sample.
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Yusuke Arashida, Takayuki Suzuki, Shuhei Nara, Ikufumi Katayama, Yasuo Minami, Satoshi Shindo, Yuji … Show more authors
Yusuke Arashida, Takayuki Suzuki, Shuhei Nara, Ikufumi Katayama, Yasuo Minami, Satoshi Shindo, Yuji Sutou, Toshiharu Saiki, Jun Takeda Hide authors
Applied Physics Letters 119 ( 6 ) 061102-1 - 061102-4 2021.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrastrong magnon–magnon coupling dominated by antiresonant interactions
Takuma Makihara, Kenji Hayashida, G. Timothy Noe II, Xinwei Li, Nicolas Marquez Peraca, Xiaoxuan Ma … Show more authors
Takuma Makihara, Kenji Hayashida, G. Timothy Noe II, Xinwei Li, Nicolas Marquez Peraca, Xiaoxuan Ma, Zuanming Jin, Wei Ren, Guohong Ma, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Dmitry Turchinovich, Shixun Cao, Motoaki Bamba, Junichiro Kono Hide authors
Nature Communications 12 ( 1 ) 3115-1 - 3115-9 2021.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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High-throughput terahertz spectral line imaging using an echelon mirror
Gaku Asai, Daiki Hata, Shintaro Harada, Tatsuki Kasai, Yusuke Arashida, Ikufumi Katayama
Optics Express 29 ( 3 ) 3515 - 3523 2021.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Optical Society Joint Work
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Waveform sampling on an atomic scale
Jun Takeda, Ikufumi Katayama
Nature Photonics 15 ( 2 ) 70 - 71 2021.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz-Field-Driven Scanning Tunneling Luminescence Spectroscopy
Kensuke Kimura, Yuta Morinaga, Hiroshi Imada, Ikufumi Katayama, Kanta Asakawa, Katsumasa Yoshioka, … Show more authors
Kensuke Kimura, Yuta Morinaga, Hiroshi Imada, Ikufumi Katayama, Kanta Asakawa, Katsumasa Yoshioka, Yousoo Kim, Jun Takeda Hide authors
ACS Photonics 8 ( 4 ) A - F 2021.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Observation of STM-luminescence induced by THz-field-driven tunneling electrons
Kimura Kensuke, Morinaga Yuta, Imada Hiroshi, Katayama Ikufumi, Asakawa Kanta, Yoshioka Katsumasa, … Show more authors
Kimura Kensuke, Morinaga Yuta, Imada Hiroshi, Katayama Ikufumi, Asakawa Kanta, Yoshioka Katsumasa, Kim Yousoo, Takeda Jun Hide authors
Abstract book of Annual Meeting of the Japan Society of Vacuum and Surface Science 2021 ( 0 ) 2Cp05R 2021
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Vacuum and Surface Science Joint Work
<p>In this work, we developed a novel nano-spectroscopy technique, entitled terahertz-field-driven scanning tunneling luminescence (THz-STL) spectroscopy, based on a scanning tunneling microscope (STM). THz-STL spectroscopy combines two cutting-edge STM techniques, THz-STM and STL spectroscopy, and enables to investigate atomic-scale energy dissipations triggered by a THz single-cycle pulse. We introduced single-cycle THz pulses into an STM junction (Au tip and Ag(111)) and measured visible photons generated by THz-field-driven electrons. By utilizing this technique, we detected the radiative decay of a localized plasmon excited by THz-field-driven electrons and clarified mechanistic differences in plasmon excitation between field- and DC-driven electrons.</p>
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High-Repetition-Rate Single-Shot Ultrafast Spectroscopy Using Time-Stretching Method
KOBAYASHI Masataka, TAKEDA Jun, KATAYAMA Ikufumi
The Review of Laser Engineering 49 ( 4 ) 212 2021 [Reviewed] [Invited]
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Laser Society of Japan Joint Work
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Kanta Asakawa, Dang-il Kim, Shotaro Yaguchi, Mikito Tsujii, Katsumasa Yoshioka, Keisuke Kaneshima, … Show more authors
Kanta Asakawa, Dang-il Kim, Shotaro Yaguchi, Mikito Tsujii, Katsumasa Yoshioka, Keisuke Kaneshima, Yusuke Arashida, Shoji Yoshida, Hidemi Shigekawa, Masashi Kuwahara, Ikufumi Katayama, Jun Takeda Hide authors
Applied Physics Letters 117 ( 21 ) 1102-1 - 1102-5 2020.11 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Joint Work
A scanning probe microscope coupled with either femtosecond laser pulses or terahertz pulses holds great promise not only for observing ultrafast phenomena but also for fabricating desirable structures at the nanoscale. In this study, we demonstrate that a few-nanometer-scale phase change can be non-thermally stored on the Ge2Sb2Te5 surface by a laser-driven scanning tunneling microscope (STM). An atomically flat Ge2Sb2Te5 surface was irradiated with the optical near-field generated by introducing femtosecond laser pulses to the STM tip-sample junction. The STM topographic images showed that few-nanometer-scale mounds appeared after irradiation. In addition, tunneling conductance spectra showed that the bandgap increased by 0.2 eV in the area of 5 × 5 nm2. These indicate that the nanoscale crystal-to-amorphous phase change was induced by the STM-tip-induced near field. Our approach presented here offers an unprecedented increase in the recording density of optical storage devices and is, therefore, expected to facilitate the development of next-generation information technology.
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Li Xinwei, Yoshioka Katsumasa, Zhang Qi, Peraca Nicolas Marquez, Katsutani Fumiya, Gao Weilu, Noe G … Show more authors
Li Xinwei, Yoshioka Katsumasa, Zhang Qi, Peraca Nicolas Marquez, Katsutani Fumiya, Gao Weilu, Noe G. Timothy II, Watson John D., Manfra Michael J., Katayama Ikufumi, Takeda Jun, Kono Junichiro Hide authors
PHYSICAL REVIEW LETTERS 125 ( 16 ) 2020.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://doi.org/10.1103/PhysRevLett.125.167401
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Supercontinuum spectral phase interferometry with isolated attosecond pulse
Oshima Akihiro, Mashiko Hiroki, Chen Ming-Chang, Katayama Ikufumi, Takeda Jun, Oguri Katsuya
JSAP Annual Meetings Extended Abstracts 2020.2 ( 0 ) 667 - 667 2020.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Applied Physics Joint Work
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Spatially resolved spectral phase interferometry with an isolated attosecond pulse
Hiroki Mashiko, Ming-Chang Chen, Koji Asaga, Akihiro Oshima, Ikufumi Katayama, Jun Takeda, Tadashi … Show more authors
Hiroki Mashiko, Ming-Chang Chen, Koji Asaga, Akihiro Oshima, Ikufumi Katayama, Jun Takeda, Tadashi Nishikawa, Katsuya Oguri Hide authors
Optics Express 28 ( 14 ) 21025 - 21034 2020.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast optical modulation of Dirac electrons in gated single-layer graphene
Katayama Ikufumi, Inoue Kei-ichi, Arashida Yusuke, Wu Yang, Yang Hyunsoo, Inoue Taiki, Chiashi Shoh … Show more authors
Katayama Ikufumi, Inoue Kei-ichi, Arashida Yusuke, Wu Yang, Yang Hyunsoo, Inoue Taiki, Chiashi Shohei, Maruyama Shigeo, Nagao Tadaaki, Kitajima Masahiro, Takeda Jun Hide authors
PHYSICAL REVIEW B 101 ( 24 ) 245408 2020.6 [Reviewed]
DOI Web of Science CiNii Research
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS}) Joint Work
Fermi level dependence of ultrafast optical responses of single-layer graphene has been investigated using sub-10-fs pump-probe spectroscopy under bias voltages. We observe the ultrafast thermalization of photoexcited carriers, whose dynamics can be modulated via bias-induced change of the Fermi level. The relaxation time and the amplitude of the electronic response are maximized when the Fermi level reaches approximately half of the excitation photon energy. From the analysis of the pump-pulse-induced optical conductivity change, we find that the bias-induced blocking of the relaxation pathways and the pump-induced change of the electronic temperature and the Fermi level significantly contribute to the observed ultrafast optical modulation. The results demonstrate the controllability of the ultrafast optical responses in single-layer graphene, which could be useful for future ultrafast electro-optic graphene devices.
Other Link： https://doi.org/10.1103/PhysRevB.101.245408
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Minami Yasuo, Ofori-Okai Benjamin, Sivarajah Prasahnt, Katayama Ikufumi, Takeda Jun, Nelson Keith A … Show more authors
Minami Yasuo, Ofori-Okai Benjamin, Sivarajah Prasahnt, Katayama Ikufumi, Takeda Jun, Nelson Keith A., Suemoto Tohru Hide authors
PHYSICAL REVIEW LETTERS 124 ( 14 ) 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS}) Joint Work
Other Link： https://doi.org/10.1103/PhysRevLett.124.147401
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シングルショット時間領域分光
武田 淳、小林真隆、片山郁文
光学 49 423 - 428 2020 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Observation of Ultrastrong Magnon-Magnon Coupling in YFeO3 Using Terahertz Magnetospectroscopy
Makihara Takuma, Noe G. Timothy II, Li Xinwei, Hayashida Kenji, Peraca Nicolas Marquez, Tian Kevin, … Show more authors
Makihara Takuma, Noe G. Timothy II, Li Xinwei, Hayashida Kenji, Peraca Nicolas Marquez, Tian Kevin, Ma Xiaoxuan, Jin Zuanming, Ren Wei, Ma Guohong, Cao Shixun, Katayama Ikufumi, Takeda Jun, Turchinovich Dmitry, Nojiri Hiroyuki, Bamba Motoaki, Kono Junichiro Hide authors
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2020
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Subcycle mid-infrared coherent transients at 4 MHz repetition rate applicable to light-wave-driven scanning tunneling microscopy
Katsumasa Yoshioka, Ippo Igarashi, Shoji Yoshida, Yusuke Arashida, Ikufumi Katayama, Jun Takeda, an … Show more authors
Katsumasa Yoshioka, Ippo Igarashi, Shoji Yoshida, Yusuke Arashida, Ikufumi Katayama, Jun Takeda, and Hidemi Shigekawa Hide authors
Optics Letters 44 ( 21 ) 5350 - 5353 2019.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz field-induced phenomena in Dirac electron systems
55 ( 54 ) 589 - 599 2019.11 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://iss.ndl.go.jp/books/R100000002-I000000008643-00
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Selective Reduction Mechanism of Graphene Oxide Driven by the Photon Mode versus the Thermal Mode
Masaki Hada, Kiyoshi Miyata, Satoshi Ohmura, Yusuke Arashida, Kohei Ichiyanagi, Ikufumi Katayama, T … Show more authors
Masaki Hada, Kiyoshi Miyata, Satoshi Ohmura, Yusuke Arashida, Kohei Ichiyanagi, Ikufumi Katayama, Takayuki Suzuki, Wang Chen, Shota Mizote, Takayoshi Sawa, Takayoshi Yokoya, Toshio Seki, Jiro Matsuo, Tomoharu Tokunaga, Chihiro Itoh, Kenji Tsuruta, Ryo Fukaya, Shunsuke Nozawa, Shin-ichi Adachi, Jun Takeda, Ken Onda, Shin-ya Koshihara, Yasuhiko Hayashi, Yuta Nishina Hide authors
ACS Nano 2019 Vol.13 ( 9 ) 10103 - 10112 2019.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ACS Publications Joint Work
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Raghu Dharmavarapu, Ken-ichi Izumi, Ikufumi Katayama, Soon Hock Ng, Jitraporn Vongsvivut, Mark J. T … Show more authors
Raghu Dharmavarapu, Ken-ichi Izumi, Ikufumi Katayama, Soon Hock Ng, Jitraporn Vongsvivut, Mark J. Tobin, Aleksandr Kuchmizhak, Yoshiaki Nishijima, Shanti Bhattacharya, Saulius Juodkazis Hide authors
Nanophotonics Vol.8 ( 7 ) 1263 - 1270 2019.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://doi.org/10.1515/nanoph-2019-0112
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An echelon-based single shot optical and terahertz Kerr effect spectrometer
Griffin Mead, Ikufumi Katayama, Jun Takeda, Geoffrey A. Blake
Review of Scientific Instruments Vol.90 ( 5 ) 2019.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Joint Work
Other Link： https://doi.org/10.1063/1.5088377
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Multi-timescale pump-probe spectroscopy using time-encoding and time-stretching methods
Ikufumi Katayama,Masataka Kobayashi,J. Johnson
SPIE.DIGITAL LIBRARY 2019.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Fast-frame single-shot pump-probe spectroscopy with chirped-fiber Bragg gratings
Masataka Kobayashi, Yusuke Arashida, Genki Yamashita, Eiichi Matsubara, Masaaki Ashida, Jeremy A. J … Show more authors
Masataka Kobayashi, Yusuke Arashida, Genki Yamashita, Eiichi Matsubara, Masaaki Ashida, Jeremy A. Johnson, and Ikufumi Katayama Hide authors
Optics Letters 44 ( 1 ) 163 - 166 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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High precision frequency measurement of terahertz waves using optical combs from a Mach–Zehnder-modulator-based flat comb generator
Isao Morohashi, Ikufumi Katayama, Mayu Kirigaya, Yoshihisa Irimajiri, Norihiko Sekine, and Iwao Hos … Show more authors
Isao Morohashi, Ikufumi Katayama, Mayu Kirigaya, Yoshihisa Irimajiri, Norihiko Sekine, and Iwao Hosako Hide authors
Optics Letters 44 ( 3 ) 487 - 490 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz Faraday and Kerr Rotation Spectroscopy of Bi1-xSbx Films in High Magnetic Fields up to 30 Tesla
X. Li, K. Yoshioka, M. Xie, T. Hagiwara, G. T. Noe II, W. Lee, N. Marquez Peraca, W. Gao, T. Hagiwa … Show more authors
X. Li, K. Yoshioka, M. Xie, T. Hagiwara, G. T. Noe II, W. Lee, N. Marquez Peraca, W. Gao, T. Hagiwara, H. S. Orjan, L-W. Nien, T. Nagao, M. Kitajima, H. Nojiri, X. Li, C-K. Shih, A. H. MacDonald, I. Katayama, J. Takeda, G. A. Fiete, and J. Kono Hide authors
Physical Review B 100 ( 11 ) 115145：1 - 15 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Electric dipole oscillation in solids characterized by Fourier transform extreme ultraviolet attosecond spectroscopy
Chisuga Yuta, Mashiko Hiroki, Oguri Katsuya, Katayama Ikufumi, Takeda Jun, Gotoh Hideki
XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018) 205 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields
Yoshioka Katsumasa, Katayama Ikufumi, Arashida Yusuke, Ban Atsuhiko, Kawada Yoichi, Takahashi Hiron … Show more authors
Yoshioka Katsumasa, Katayama Ikufumi, Arashida Yusuke, Ban Atsuhiko, Kawada Yoichi, Takahashi Hironori, Takeda Jun Hide authors
XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018) 205 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast carrier generation in Bi1-xSbx thin films induced by intense monocycle terahertz pulses
Katayama Ikufumi, Kawakami Hiroki, Araki Kotaro, Arashida Yusuke, Minami Yasuo, Nien Lie-Wei, Hande … Show more authors
Katayama Ikufumi, Kawakami Hiroki, Araki Kotaro, Arashida Yusuke, Minami Yasuo, Nien Lie-Wei, Handegard Orjan Sele, Nagao Tadaaki, Kitajima Masahiro, Takeda Jun Hide authors
XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018) 205 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Terahertz-field-induced carrier generation in Bi1−xSbx Dirac electron systems
I. Katayama,H. Kawakami,T. Hagiwara,Y. Arashida,Y. Minami,L.-W. Nien,O. S. Handegard,T. Nagao,M. Ki … Show more authors
I. Katayama,H. Kawakami,T. Hagiwara,Y. Arashida,Y. Minami,L.-W. Nien,O. S. Handegard,T. Nagao,M. Kitajima,and J. Takeda Hide authors
PHYSICAL REVIEW B 98 ( 21 ) 214302-1 - 214302-5 2018.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique
Yusuke Arashida, Kyosuke Murakami, Ikufumi Katayama and Jun Takeda
Applied Physics Express 11 ( 12 ) 122701-1 - 122701-4 2018.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Nonlinear terahertz dynamics of Dirac electrons in Bi thin films
Ikufumi Katayama,Yasuo Minami,Yusuke Arashida,Orjan S. Handegard,Tadaaki Nagao,Masahiro Kitajima,Ju … Show more authors
Ikufumi Katayama,Yasuo Minami,Yusuke Arashida,Orjan S. Handegard,Tadaaki Nagao,Masahiro Kitajima,Jun Takeda Hide authors
Proceedings 10756 2018.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Long-lived photoinduced response observed under extreme photoexcitation densities in a one-dimensional Peierls insulator
Johanna W. Wolfson, Samuel W. Teitelbaum, Taeho Shin, Ikufumi Katayama, Taro Kawano, Jun Takeda, an … Show more authors
Johanna W. Wolfson, Samuel W. Teitelbaum, Taeho Shin, Ikufumi Katayama, Taro Kawano, Jun Takeda, and Keith A. Nelson Hide authors
Phys. Rev. B 98 ( 5 ) 2018.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields
Yoshioka Katsumasa,Katayama Ikufumi,Arashida Yusuke,Ban Atsuhiko,Kawada Yoichi,Konishi Kuniaki,Taka … Show more authors
Yoshioka Katsumasa,Katayama Ikufumi,Arashida Yusuke,Ban Atsuhiko,Kawada Yoichi,Konishi Kuniaki,Takahashi Hironori,Takeda Jun Hide authors
Nano Lett 18 ( 8 ) 5198 - 5204 2018.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Bias-induced modulation of ultrafast carrier dynamics in metallic single-walled carbon nanotubes
Keisuke Maekawa, Kazuhiro Yanagi, Yasuo Minami, Masahiro Kitajima1,Ikufumi Katayama, Jun Takeda,
Phys. Rev. B 97 ( 7 ) 2018.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：APS Physics Joint Work
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Nanoscale electron manipulation in metals with intense THz electric fields
Jun Takeda, Katsumasa Yoshioka, Yasuo Minami and Ikufumi Katayama
Journal of Physics D: Applied Physics 51 ( 10 ) 2018.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing Single Work
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Multi-petahertz electron interference in Cr:Al2O3 solid-state material
Hiroki Mashiko,Yuta Chisuga,Ikufumi Katayama,Katsuya Oguri,Hiroyuki Masuda,Jun Takeda,Hideki Gotoh
Nature Communications 9 ( 1468 ) 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Anharmonic phonon-polariton dynamics in ferroelectric LiNbO3 studied with single-shot pump-probe imaging spectroscopy
T.Kuribayashi,T.Motoyama,Y.Arashida,I.Katayama,J.Takeda
Journal of Applied Physics 123 ( 17 ) 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses
Yoichi Kawada, Katsumasa Yoshioka, Yusuke Arashida, Ikufumi Katayama, Jun Takeda, and Hironori Taka … Show more authors
Yoichi Kawada, Katsumasa Yoshioka, Yusuke Arashida, Ikufumi Katayama, Jun Takeda, and Hironori Takahashi Hide authors
Optics Express 26 ( 23 ) 30420 - 30434 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Sub-cycle Control of Electrons in a Tunnel Junction with THz Near-fields
Yoshioka Katsumasa, Ban Atsuhiko, Katayama Ikufumi, Arashida Yusuke, Kawada Yoichi, Takahashi Hiron … Show more authors
Yoshioka Katsumasa, Ban Atsuhiko, Katayama Ikufumi, Arashida Yusuke, Kawada Yoichi, Takahashi Hironori, Takeda Jun Hide authors
Meeting Abstracts of the Physical Society of Japan 73 ( 0 ) 1492 - 1492 2018 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Physical Society of Japan Joint Work
Other Link： https://ci.nii.ac.jp/naid/130007646534
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Vacuum Bloch?Siegert shift in Landau polaritons with ultra-high cooperativity
X. Li, M.Bamba, Q. Zhang, S. Fallahi, G. C. Gardner, W. Gao, M. Lou, K. Yoshioka, M. J. Manfra, and … Show more authors
X. Li, M.Bamba, Q. Zhang, S. Fallahi, G. C. Gardner, W. Gao, M. Lou, K. Yoshioka, M. J. Manfra, and J. Kono Hide authors
Nat. Photon. 12 324-329 - 329 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Simultaneous Acquisition of Complex Transmittance and Birefringence with Two Counter-Rotating Circularly Polarized THz Pules,
Y. Kawada, K. Yoshioka, Y. Arashida, I. Katayama, J. Takeda, and H. Takahash
Opt. Exp. 26 030420 - 030434 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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高強度テラヘルツ波によるナノ空間電子制御
武田 淳、片山郁文、吉岡克将
固体物理 52 439 - 446 2017 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Single-Shot Terahertz Time-Domain Spectroscopy in Pulsed High Magnetic Fields
G. T. Noe, I. Katayama, F. Katsutani, J. J. Allred, J. A. Horowitz, D. M. Sullivan, Q. Zhang, F. Se … Show more authors
G. T. Noe, I. Katayama, F. Katsutani, J. J. Allred, J. A. Horowitz, D. M. Sullivan, Q. Zhang, F. Sekiguchi, G. L. Woods, M. C. Hoffmann, H. Nojiri, J. Takeda, and J. Kono Hide authors
Optics Express 24 ( 26 ) 30328 2016.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：OSA Joint Work
Other Link： https://www.osapublishing.org/oe/home.cfm
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K. Yoshioka, I. Katayama, Y. Minami, and J. Takeda
Nature Photonics 10 ( 12 ) 762 - 765 2016.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
Other Link： http://www.nature.com/nphoton/index.html
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High-Acquisition-Rate Single-Shot Pump-Probe Measurements Using Time-Stretching Method
M. Kobayashi, Y. Minami, C. L. Johnson, P. D. Salmans, N. R. Ellsworth, J. Takeda, J. A. Johnson, a … Show more authors
M. Kobayashi, Y. Minami, C. L. Johnson, P. D. Salmans, N. R. Ellsworth, J. Takeda, J. A. Johnson, and I. Katayama Hide authors
Scientific Reports 6 37614;1 - 6 2016.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
Other Link： http://www.nature.com/srep/
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Single-Shot Terahertz Time-Domain Spectroscopy in Pulsed High Magnetic Fields
G. T. Noe, I. Katayama, F. Katsutani, J. J. Allred, J. A. Horowitz, D. M. Sullivan, Q. Zhang, F. Se … Show more authors
G. T. Noe, I. Katayama, F. Katsutani, J. J. Allred, J. A. Horowitz, D. M. Sullivan, Q. Zhang, F. Sekiguchi, G. L. Woods, M. C. Hoffmann, H. Nojiri, J. Takeda, and J. Kono Hide authors
Opt. Exp. 24 30326 - 30337 2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz-Induced Acceleration of Massive Dirac Electrons in Semimetal Bismuth
Y. Minami, K. Araki, T. D. Dao, T. Nagao, M. Kitajima, J. Takeda, and I. Katayama
Scientific Reports 5 15870;1 - 6 2015.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
Terahertz-Induced Acceleration of Massive Dirac Electrons in Semimetal Bismuth
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Y. Minami, K. Horiuchi, K. Masuda, J. Takeda, and I. Katayama
Applied Physics Letters 107 ( 17 ) 171104;1 - 4 2015.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Joint Work
We have demonstrated accurate observations of terahertz (THz) dielectric response due to photoexcited carriers in a Si plate via single-shot optical-pump and THz-probe spectroscopy. In contrast to conventional THz time-domain spectroscopy, this spectroscopic technique allows single-shot detection of the THz response of materials at a given delay time between the pump and THz pulses, thereby sufficiently extending the time interval between the pump pulses. As a result, we can accurately measure the dielectric properties of materials, while avoiding artifacts in the response caused by the accumulation of long-lived photoexcited carriers. Using our single-shot scheme, the transmittance of a Si plate was measured in the range of 0.5-2.5 THz with different pump fluences. Based on a Drude model analysis, the optically induced complex dielectric constant, plasma frequency, and damping rate in the THz region were quantitatively evaluated. (C) 2015 AIP Publishing LLC.
Other Link： http://aip.scitation.org/journal/apl
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ナノカーボンのディラック電子＝フォノン間相互作用ダイナミクス
片山郁文、武田淳、北島正弘
日本物理学会誌 70 770 - 775 2015.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
サブ10 fsの超短パルスレーザーを用いた超高速分光法によるMass-less Dirac電子系の電子格子相互作用を明らかにした研究を紹介した論文
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M. Hada, W. Oba, M. Kuwahara, I. Katayama, T. Saiki, J. Takeda, and K. G. Nakamura
Scientific Reports 5 13530;1 - 9 2015.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
Because of their robust switching capability, chalcogenide glass materials have been used for a wide range of applications, including optical storages devices. These phase transitions are achieved by laser irradiation via thermal processes. Recent studies have suggested the potential of nonthermal phase transitions in the chalcogenide glass material Ge2Sb2Te5 triggered by ultrashort optical pulses; however, a detailed understanding of the amorphization and damage mechanisms governed by nonthermal processes is still lacking. Here we performed ultrafast time-resolved electron diffraction and single-shot optical pump-probe measurements followed by femtosecond near-ultraviolet pulse irradiation to study the structural dynamics of polycrystalline Ge2Sb2Te5. The experimental results present a nonthermal crystal-to-amorphous phase transition of Ge2Sb2Te5 initiated by the displacements of Ge atoms. Above the fluence threshold, we found that the permanent amorphization caused by multi-displacement effects is accompanied by a partial hexagonal crystallization.
Other Link： http://www.nature.com/srep/
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Real-Time Observation of Phonon-Polariton Dynamics in Ferroelectric LiNbO3 in Time-Frequency Space
Y. Ikegaya, H. Sakaibara, Y. Minami, I. Katayama and J. Takeda
Applied Physics Letters 107 ( 6 ) 062901;1 - 5 2015.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS Joint Work
We demonstrate the real-time observation of phonon-polariton propagation in ferroelectric LiNbO3 using a single-shot spectroscopic setup that employs an echelon mirror. The echelon mirror provides a spatially encoded time delay for the probe pulse; therefore, the ultrafast transient behavior of materials can be detected on a single-shot basis. Using optical Kerr gate apparatus, forward and backward propagating E-mode phonon-polaritons were simultaneously induced via an impulsive stimulated Raman scattering process, and subsequently, their dynamics were readily mapped in time-frequency space using heterodyne detection. The two phonon-polaritons appeared on opposite sides of the central probe wavelength and were symmetrically imaged against the ordinary and extraordinary probe lights. By taking into account coupling of the lowest E-mode phonon-polariton to a low-frequency relaxational mode, not only the phonon-polariton dispersion but also the wavevector dependence of the damping rate was unveiled and quantitatively evaluated. (C) 2015 AIP Publishing LLC.
Other Link： http://aip.scitation.org/journal/apl
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反射型エシェロンを用いた時間・周波数2次元イメージング分光
武田淳，南康夫，片山郁文
レーザー研究 43 208 - 212 2015.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
反射型エシェロンを用いて時間周波数イメージングを行う技術について解説した。
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Terahertz-field-induced Nonlinear Electron Delocalization in Au Nanostructures
Katsumasa Yoshioka, Yasuo Minami, Ken-ichi Shudo, Thang D. Dao, Tadaaki Nagao, Masahiro Kitajima, J … Show more authors
Katsumasa Yoshioka, Yasuo Minami, Ken-ichi Shudo, Thang D. Dao, Tadaaki Nagao, Masahiro Kitajima, Jun Takeda, and Ikufumi Katayama Hide authors
Nano Letters 15 ( 2 ) 1036 - 1040 2015.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
Other Link： http://pubs.acs.org/journal/nalefd
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Ultrafast Time-Resolved Electron Diffraction Revealing the Nonthermal Dynamics of Near-UV Photoexcitation-Induced Amorphization in Ge2Sb2Te5
M. Hada, W. Oba, M. Kuwahara, I. Katayama, T. Saiki, J. Takeda, and K. G. Nakamura
Sci. Rep. 5 ( 1530 ) 1 - 9 2015
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz Dielectric Response of Photoexcited Carriers in Si Revealed via Single-Shot Optical-Pump and Terahertz-Probe Spectroscopy
Y. Minami, K. Horiuchi, K. Masuda, J. Takeda, and I. Katayama
Appl. Phys. Lett. 107 ( 171104 ) 1 - 4 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz-Induced Acceleration of Massive Dirac Electrons in Semimetal Bismuth
Y. Minami, K. Araki, T. D. Dao, T. Nagao, M. Kitajima, J. Takeda, and I. Katayama
Sci. Rep. 5 ( 15870 ) 1 - 6 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Real-Time Observation of Phonon-Polariton Dynamics in Ferroelectric LiNbO3 in Time-Frequency Space
Y. Ikegaya, H. Sakaibara, Y. Minami, I. Katayama and J. Takeda
Appl. Phys. Lett 107 ( 062901 ) 1 - 5 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Terahertz-field-induced Nonlinear Electron Delocalization in Au Nanostructures
K. Yoshioka, Y. Minami, K. Shudo, T. D. Dao, T. Nagao, M. Kitajima, J. Takeda, and I. Katayama,
Nano Letters 15 1036 - 1040 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Time-Frequency Two-Dimensional Imaging Spectroscopy Using a Reflective Echelon Mirror
J. Takeda, Y. Minami, and I. Katayama,
Rev. Laser Eng 43 208 - 212 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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K. Sato, K. Tahara, Y. Minami, I. Katayama, M. Kitajima, H. Kawai, K. Yanagi, and J. Takeda
Physical Review B 90 ( 23 ) 235435: 1 - 5 2014.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society Joint Work
Other Link： http://journals.aps.org/prb/
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Nonlinear electron dynamics of gold ultrathin films induced by intense terahertz waves
Yasuo Minami, Jun Takeda, Thang Duy Dao, Tadaaki Nagao, Masahiro Kitajima, and Ikufumi Katayama
Applied Physics Letters 105 ( 24 ) 241107: 1 - 4 2014.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Joint Work
Other Link： http://scitation.aip.org/content/aip/journal/apl
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片山郁文、南康夫、武田淳
表面科学 35 ( 12 ) 680 - 685 2014.12 [Reviewed] [Invited]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：表面科学会 Joint Work
テラヘルツ時間領域分光法を用いた、線形非線形の分光結果に関する解説を行った。フォノン、キャリア、超伝導ギャップの非線形性を議論した。
Other Link： https://www.jstage.jst.go.jp/browse/jsssj/35/12/_contents/-char/ja/
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Jun Takeda, Wataru Oba, Yasuo Minami, Toshiharu Saiki, and Ikufumi Katayama
Applied Physics Letters 104 ( 26 ) 261903: 1 - 4 2014.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Joint Work
Other Link： http://scitation.aip.org/content/aip/journal/apl
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Ultra-broadband IR and THz generation and detection with ultrashort pulses
Masaaki Ashida, Eiichi Matsubara, and Ikufumi Katayama
Proceedings of SPIE 8964 896409: 1 - 15 2014.2 [Reviewed] [Invited]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://spie.org/x573.xml
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Broadband pump-probe imaging spectroscopy applicable to ultrafast single-shot events
Yasuo Minami, Hiromoto Yamaki, Ikufumi Katayama, and Jun Takeda
Applied Physics Express 7 ( 2 ) 022402: 1 - 3 2014.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://iopscience.iop.org/1882-0786/
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Coherent phonon and surface-enhanced Raman scattering dynamics in solids
Jun Takeda, Ikufumi Katayama, Ken-ichi Shudo, Masahiro Kitajima
Journal of Luminescence 152 23 - 27 2014.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
Other Link： http://www.journals.elsevier.com/journal-of-luminescence/
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Taro Kawano, Ikufumi Katayama, Jun Ohara, Masaaki Ashida, and Jun Takeda
Journal of the Physical Society of Japan 83 ( 1 ) 014713: 1 - 6 2014.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://journals.jps.jp/journal/jpsj
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Coherent nanoscale optical-phonon wave packet in graphene layers
I. Katayama, K. Sato, S. Koga, J. Takeda, S. Hishita, H. Fukidome, M. Suemitsu, and M. Kitajima
Physical Review B 88 ( 24 ) 245406: 1 - 5 2013.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society Joint Work
Other Link： http://journals.aps.org/prb/
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Single-shot measurement of a terahertz electric-field waveform using a reflective echelon mirror
Yasuo Minami, Yusuke Hayashi, Jun Takeda, and Ikufumi Katayama
Applied Physics Letters 103 ( 5 ) 051103: 1 - 4 2013.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Physics Joint Work
Other Link： http://scitation.aip.org/content/aip/journal/apl
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Electric field detection of phase-locked near-infrared pulses using photoconductive antenna
I. Katayama, R. Akai, M. Bito, E. Matsubara, and M. Ashida
Optics Express 21 ( 14 ) 16248 - 16254 2013.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Electron-Phonon Coupling and Defect Scatterings in Ar+-ion Implanted Graphite
I. Katayama, S. Koga, J. Takeda, S. Hishita, D. Fujita and M. Kitajima
Journal of the Ceramic Society of Japan 121 ( 3 ) 291 - 294 2013.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast Quasiparticle Dynamics of FeTe0.75Se0.25 Superconductor
Y. Kabasawa, T. Eda, J. Hu, I. Katayama, J. Takeda, M. Kitajima, T. Katagiri, T. Sasagawa, and K. G … Show more authors
Y. Kabasawa, T. Eda, J. Hu, I. Katayama, J. Takeda, M. Kitajima, T. Katagiri, T. Sasagawa, and K. G. Nakamura Hide authors
Ultrafast Phenomena XVIII (Lausanne, 2012), accepteUltrafast Phenomena XVIII, EPJ Web of Conferences 41 ( 03009 ) 1 - 3 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The European Physical Journal Conferences Joint Work
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Ultrafast Measurements of Coherent Vibrations in Benzenethiol Monolayer Film
K. Shudo, K. Doi, I. Katayama, M. Kitajima, and J. Takeda
Ultrafast Phenomena XVIII, EPJ Web of Conferences 41 ( 0513 ) 1 - 3 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Resonant Enhancement of Coherent Phonons in Carbon Nanotubes Observed with Sub-10fs Time Resolution Ultrafast Phenomena XVIII
I. Katayama, K. Tahara, J. Takeda, K. Yanagi J. Tang, and M. Kitajima,
EPJ Web of Conferences 41 ( 04028 ) 1 - 3 2013
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Electron-Phonon Coupling and Defect Scatterings in Ar+-ion Implanted Graphite
I. Katayama, S. Koga, J. Takeda, S. Hishita, D. Fujita and M. Kitajima,
J. Cer. Soc. Jpn 121 291 - 294 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Electric Field Detection of Phase-Locked Near-Infrared Pulses Using Photoconductive Antenna
I. Katayama, R. Akai, M. Bito, E. Matsubara, and M. Ashida,
Opt. Exp. 21 16248 - 16254 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Single-Shot Measurement of a Terahertz Electric-Field Waveform Using a Reflective Echelon Mirror
Y. Minami, Y. Hayashi, J. Takeda and I. Katayama,
Appl. Phys. Lett. 103 ( 051103 ) 1 - 4 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Coherent Nanoscale Optical-Phonon Wavepacket in Graphene Layers"
I. Katayama, K. Sato, S. Koga, J. Takeda, S. Hishita, H. Fukidome, M. Suemitsu and M. Kitajima,
Phys. Rev. B 88 ( 25406 ) 1 - 5 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Photoluminescence Dynamics in CuCl Thin Films under High-Dense One- and Two-Photon Excitations
M. Ando, S. Uozumi, I. Katayama, M. Ichimiya, M. Ashida, and J. Takeda
Physica Status Solidi C 9 ( 12 ) 2493 - 2496 2012.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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M. Ando, M. Yazaki, I. Katayama, H. Ichida, S. Wakaiki, Y. Kanematsu, and J. Takeda
Physical Review B 86 ( 15 ) 155206: 1 - 6 2012.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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光パルス及び強誘電体フォノンポラリトンのシングルショット時間・周波数イメージング
武田 淳、片山郁文
レーザー研究 40 ( 8 ) 598 - 602 2012.8 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Surface Metallic States in Ultrathin Bi(001) Films Studied with Terahertz Time-Domain Spectroscopy
K. Yokota, J. Takeda, C. Dang, G. Han, D. N. McCarthy, T. Nagao, S. Hishita, M. Kitajima, and I. Ka … Show more authors
K. Yokota, J. Takeda, C. Dang, G. Han, D. N. McCarthy, T. Nagao, S. Hishita, M. Kitajima, and I. Katayama Hide authors
Applied Physics Letters 100 ( 25 ) 251605: 1 - 5 2012.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Single-Shot Time-Frequency Imaging Spectroscopy Using an Echelon Mirror
H. Sakaibara, Y. Ikegaya, I. Katayama and J. Takeda
Optics Letters 37 ( 6 ) 1118 - 1120 2012.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Electric Field Detection of Coherent Synchrotron Radiation in a Storage Ring Generated Using Laser Bunch Slicing
I. Katayama, H. Shimosato, M. Bito, K. Furusawa, M. Adachi, M. Shimada, H. Zen, S. Kimura, N. Yamam … Show more authors
I. Katayama, H. Shimosato, M. Bito, K. Furusawa, M. Adachi, M. Shimada, H. Zen, S. Kimura, N. Yamamoto, M. Hosaka, M. Katoh, and M. Ashida Hide authors
Applied Physics Letters 100 ( 11 ) 111112: 1 - 4 2012.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Na … Show more authors
I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai and K. Tanaka Hide authors
Physical Review Letters 108 ( 9 ) 097401: 1 - 5 2012.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Photoluminescence Dynamics due to Biexcitons and Exciton-Exciton Scattering in Layered-Type Semiconductor PbI2
M. Ando, M. Yazaki, I. Katayama, H. Ichida, S. Wakaiki, Y. Kanematsu, and J. Takeda,
Phys. Rev. B 86 ( 155206 ) 1 - 6 2012 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Physical review. B Joint Work
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Real-Time Time-Frequency Imaging of Ultrashort Laser Pulses Using an Echelon Mirror
I. Katayama, H. Sakaibara, and J. Takeda
Japanese Journal of Applied Physics 50 102701: 1 - 5 2011.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast Dynamics of Surface-Enhanced Raman Scattering Due to Au Nanostructures
I. Katayama, S. Koga, K. Shudo, J. Takeda, T. Shimada, A. Kubo, S. Hishita, D. Fujita, and M. Kitaj … Show more authors
I. Katayama, S. Koga, K. Shudo, J. Takeda, T. Shimada, A. Kubo, S. Hishita, D. Fujita, and M. Kitajima Hide authors
Nano Letters 11 ( 7 ) 2648 - 2654 2011.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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High-Frequency Coherent Phonons in Graphene on Silicon
S. Koga, I. Katayama, S. Abe, H. Fukidome, M. Suemitsu, M. Kitajima and J. Takeda
Applied Physics Express 4 ( 4 ) 045101: 1 - 3 2011.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Coherent optical phonons in the iron oxypnictide SmFeAsO1-xFx (x=0.075)
H. Takahashi, Y. Kamihara, H. Koguchi, T. Atou, H. Hosono, I. Katayama, J. Takeda, M. Kitajima, K. … Show more authors
H. Takahashi, Y. Kamihara, H. Koguchi, T. Atou, H. Hosono, I. Katayama, J. Takeda, M. Kitajima, K. G. Nakamura Hide authors
Journal of the Physical Society of Japan 80 ( 1 ) 013707: 1 - 4 2011.1
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrabroadband terahertz generation using 4-N,N-dimethylamino-4_-N_-methyl-stilbazolium tosylate single crystals
I. Katayama, R. Akai, M. Bito, H. Shimosato, K. Miyamoto, H. Ito, and M. Ashida
Applied Physics Letters 97 ( 2 ) 021105: 1 - 3 2010.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Real-Time Time-Frequency Two-Dimensional Imaging of Ultrafast Transient Signals in Solid-State Organic Materials
J. Takeda, A. Ishida, Y. Makishima, and I. Katayama
Sensors 10 ( 5 ) 4253 - 4269 2010.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Broadband terahertz spectroscopy and its application to the thin films
I. Katayama and M. Ashida
Journal of the Vacuum Society of Japan 53 ( 5 ) 301 - 308 2010.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Energy Transfer Dynamics in Light-Harvesting Small Dendrimers Studied by Time-Frequency Two-Dimensional Imaging Spectroscopy
A. Yamada, A. Ishida, I. Akai, M. Kimura, I. Katayama and J. Takeda
Journal of Luminescence 129 ( 12 ) 1898 - 1900 2009.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Photoinduced Phase Transition in Strongly Correlated TTTA Crystals Probed with Two-Photon Luminescence
I. Katayama, K. Mitarai, T. Kon, and J. Takeda
Journal of Luminescence 129 ( 12 ) 1931 - 1933 2009.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Nonlinear Conversion Dynamics from Self-Trapped Exciton States to a Macroscopic Photoinduced Phase in Strongly Correlated Organic Radical Crystals
I. Katayama, T. Kon, K. Mitarai and J. Takeda
Physical Review B 80 ( 9 ) 092103: 1 - 4 2009.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ultrafast Lasing due to Electron-Hole Plasma in ZnO Nano-Multipods
S. Mitsubori, I. Katayama, S. H. Lee, T. Yao and J. Takeda
Journal of Physics Condensed Matter 21 ( 6 ) 064211: 1 - 5 2009.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Highly Efficient Photoinduced Phase Transitions in an Organic Radical Crystal via Two-Photon Absorption Process
T. Kon, S. Oguri, I. Katayama, T. Kodaira and J. Takeda
Physical Review B 79 ( 3 ) 035106: 1 - 4 2009.1
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Rapid Energy Transfer and its Temperature dependence in π-Conjugated Dendrimers
I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishi … Show more authors
I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishida, A. Yamada, I. Katayama, J. Takeda and M. Kimura Hide authors
Physica status solidi. C 6 ( 1 ) 77 - 80 2009.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Rapid Energy Transfer in a Dendrimer Having π-Conjugated Light-Harvesting Antennas
I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, H. Hash … Show more authors
I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, H. Hashimoto, A. Ishida, A. Yamada, I. Katayama, J. Takeda and M. Kimura Hide authors
New Journal of Physics 10 ( 12 ) 125024: 1 - 22 2008.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Hardening of the ferroelectric soft mode in SrTiO3 thin films
I. Katayama, H. Shimosato, D. S. Rana, I. Kawayama, M. Tonouchi, and M. Ashida
Applied Physics Letters 93 ( 13 ) 132903: 1 - 3 2008.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Thickness dependence of the soft ferroelectric mode in SrTiO3 thin filmes deposited on MgO
I. Katayama, H. Shimosato, M. Ashida, I. Kawayama, M. Tonouchi and T. Itoh
Journal of Luminescence 128 ( 5 ) 998 - 1000 2008.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Nature and Dynamics of photoexcited states in KTaO3
I. Katayama, K. Tanaka
Journal of the Physical Society of Japan 75 ( 6 ) 64713: 1 - 12 2006.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Photoexcited carrier dynamics in potassium tantalate
I. Katayama, M. Watanabe, T. Hayashi and K. Tanaka
Journal of Luminescence 112 ( 1 ) 242 - 245 2005.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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High frequency nonlinear microwave response in quantum paraelectric potassium tantalate
I. Katayama, M. Shirai and K. Tanaka
Journal of Luminescence 102-103 54 - 59 2003.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Critical behaviors of photoinduced giant permittivity in potassium tantalate
I. Katayama, Y. Ichikawa and K. Tanaka
Physical Review B 67 ( 10 ) 100102: 1 - 4 2003.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work